I actually think that the constant in and out on my OEM convertible case might have accelerated the process of the wearing away of the rubber on my PlayBook. But it's well used and had it from the beginning so I'm not too concerned about it. It hasn't made it to the back yet for me. Just the bottom around the ports.

Edit:
I misunderstood what the OP was saying. Thought he was referring to the soft touch rubber not the rubber ring between the glass and the edge. Oops.

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